[OpenSIPS-Users] OpenSips Load balancer. - Overcome limitations of Call Driven Load Balancing

[Jon Abrams]

Hi Chandan,

There may be something else purpose built for this, but you can use
the dialog profiles to track and limit the port usage:

    set_dlg_profile("outcarrier","$avp(out_carrier_id)");

    if ($avp(out_max_call_limit) > 0)
    {
        set_dlg_profile("profile","$avp(out_qos_profile_id)");
        if (get_profile_size("profile","$avp(out_qos_profile_id)","$var(out_gw_count)"))
        {
            if ($var(out_gw_count)>$avp(out_max_call_limit))
            {
                xlog("LIMIT: Call $ci - Max call limit hit by
$avp(src_addr) on QosProfile $avp(out_qos_profile_id) to gw
$avp(out_gw_id)\n");
                return(-1);
            }
        }
    }

On Fri, Jul 24, 2020 at 8:55 AM Chandan PR <chandan.pr at webshar.org> wrote:
>
> Hello Everyone,
>
> Currently, we are using Open Sips Load balancer in Call Driven load balancing.
>
> Our scenario is as below:
>
> D - Total Destinations configured at OpenSips
> P - No of Ports/Sessions Each Destination can handle concurrently
> C - Total Capacity = D*P
>
> We have a Call Loader which loads calls to OpenSips at C and as when the result comes further calls get loaded.
> For some reason, if any destination is not in the right state and sends error responses without accepting calls, this introduces a drain scenario.
> In the drain scenario where all new calls are given to the faulty destination as it has more availability.
>
> We are currently handling this by
>
> Running the loader at 80% of C
> Disabling the destination in Opensips if 75% of the calls fail for the particular destination (Attached loadbalancer.cfg file).
>
>
> But even in this case, it is possible that may call error out as the destination is free and calls are loaded.
>
> We would like to avoid this scenario to the max possible extent by limiting the number of calls we send to this particular destination.
>
> Couple of options I see are as below:
>
> Wait for a brief period before sending the response to loader when the error happens
> Make OpenSips aware of the destination capacity and adjust ports accordingly
>
> Write a custom script to poll destination capacity and use MI functions to adjust accordingly
> Or is there any possibility to integrate similar to FreeSwitch driven routing
>
> Are there any other possibilities of adjusting the OpenSips capacity dynamically or make it limit the calls sent to the particular destination?
>
> --
>
> Regards,
> Chandan Ravishankar
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